## Listing all results (182)

### How long is a Metre?

This three minute video, from Twig World, explains that the metre is the base unit for measurement for most of the world, but how was it agreed how long a metre should be? The need for standardised units of measurement is discussed and the value of the metre being one ten millionth of the distance from the North...

### Jai Singh

This video, from Twig World, explains how the city of Jaipur in India was designed by the mathematician and King Jai Singh II. In order to ‘unravel the mysteries of the Heavens’, he built a series of observatories and the largest sundial in order to make the most accurate sundial in the world.

The video is...

### Rounding: Snails Vs Rockets

This video, from Twig World, explains how we are able to measure extremes of speed, from incredibly fast to extremely slow. The degree of accuracy required when taking these measures needs to be decided. This is achieved by rounding. Examples of unhelpful rounding are given and the need for the notion of...

### Speed of the Earth

This video, from Twig World, explains that the planet earth is constantly moving through space and models the Earth’s orbit as a circle in order to approximate the distance travelled in one year and hence estimate the distance the Earth travels every second. The video is accompanied by a lesson plan and a...

### Volume: Counting Stars

This video, from Twig World, begins by asking how do astronomers estimate the number of stars in the night sky. To explain how it is done, a method of calculating the number of grains of sand on a beach is shown. The same principles are used to estimate the number of stars in the sky.

The video is...

### Black Holes

This film, from Twig World, looks at how dying stars transform into black holes and are areas of mass so great that even light can't escape.

The key points made in the film are:

•When a star dies, it collapses and condenses into a single point, known as a singularity.

•The gravitational pull...

### Hubble Space Telescope

This film, from Twig World, shows how scientists working on the Hubble Telescope, orbiting 400 miles above the Earth, fixed a fault by giving the telescope a pair of spectacles. The key points made in the film are: •The Hubble Telescope took eight years to build, from over 400,000 parts. •Initially, a fault in the...

### Milky Way's Black Hole

This film, from Twig World, looks at how scientists study black holes. Scientists believe there is a supermassive black hole 26,000 light years away at the centre of our Galaxy. But how do they know, when they can't see it?

The key points made in the film are:

•Black holes are formed when massive...

### Scale of the Universe

This film, from Twig World, looks at how big the universe is.

The key points made in the film are:

•The Universe is constantly expanding.

•The Universe is already billions of light years across.

•Our Solar System is part of the Milky Way galaxy.

•Beyond our galaxy lie many more...

### Telescopes

This film, from Twig World, looks at who invented telescopes and how they have developed throughout history.

The key points made in the film are:

•The first optical telescopes were made around 1608. •Early telescopes consisted of a convex lens and an eyepiece.

•Later telescope designs used...